J/A+A/595/A34 SOFIA Horsehead nebula region datacube (Risacher+, 2016)
The upGREAT 1.9 THz multi-pixel high resolution spectrometer for the
SOFIA Observatory.
Risacher C., Gusten R., Stutzki J., Hubers A.Bell H.-W., Buchbender C.,
Buchel D., Csengeri T., Graf U.U., Heyminck S., Higgins R.D., Honingh C.E.,
Jacobs K., Klein B., Okada Y., Parikka A., Putz P., Reyes N., Ricken O.,
Riquelme D., Simon R., Wiesemeyer H.
<Astron. Astrophys. 595, A34 (2016)>
=2016A&A...595A..34R 2016A&A...595A..34R (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Spectroscopy ; Radial velocities
Keywords: instrumentation: spectrographs - techniques: spectroscopic
Abstract:
We present a new multi-pixel high resolution (R≳107) spectrometer
for the Stratospheric Observatory for far-infrared astronomy (SOFIA).
The receiver uses 2x7-pixel subarrays in orthogonal polarization,
each in an hexagonal array around a central pixel. We present the
first results for this new instrument after commissioning campaigns in
May and December 2015 and after science observations performed in May
2016. The receiver is designed to ultimately cover the full 1.8-2.5THz
frequency range but in its first implementation, the observing range
was limited to observations of the [CII] line at 1.9THz in 2015 and
extended to 1.83-2.07THz in 2016. The instrument sensitivities are
state-of-the-art and the first scientific observations performed
shortly after the commissioning confirm that the time electronic
efficiency for large scale imaging is improved by more than an order
of magnitude as compared to single pixel receivers. An example of
large scale mapping around the Horsehead Nebula is presented here
illustrating this improvement. The array has been added to SOFIA's
instrument suite already for ongoing observing cycle 4.
Description:
On SOFIA flight 267 on December 11, 2015, the [CII] emission from a
large field towards the Horsehead nebula was recorded during an
allocated time slot of four hours.
Objects:
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RA (2000) DE Designation(s)
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05 40 59.0 -02 27 30 Horsehead nebula = Barnard 33
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 129 1 Information on data cube
horsehead.fits 2880 21486 Horsehead nebula region datacube
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See also:
J/A+A/494/977 : HCO mapping of the Horsehead (Gerin+, 2009)
J/A+A/560/A73 : Horsehead H2CO and CH3OH 30m and PdBI maps (Guzman+, 2013)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz Number of slices
32- 50 A19 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.ss)
52- 59 F8.1 m/s bVRAD Lower value of VRAD interval
61- 67 F7.1 m/s BVRAD Upper value of VRAD interval
69- 75 F7.3 m/s dVRAD Velocity resolution
77- 81 I5 Kibyte size Size of FITS file
83- 96 A14 --- FileName Name of FITS file
98-129 A32 --- Title Title of the FITS file
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Acknowledgements:
Christophe Risacher, crisache(at)mpifr.de
(End) Patricia Vannier [CDS] 21-Oct-2016